332 Questions for the topic astronomy

5d

Formation of Stars
What external factors are necessary to initiate/trigger the formation of a star, and as a consequence, a possible planetary system? Provide with pros and cons in regard to the necessity of each... more
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6d

A comet is discovered that has an orbital period of 85 years. Determine the average distance of this comet from the Sun in AU.
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16d

What is the difference between UT0, UT1 and GMT time?
Every reference I find says that they are essentially the same, which we all know really means that they are not the same, but different only by a some small amount. They also like to say that UT1... more
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17d

Light is gathered from a distant star and one of teh spectral lines is observed at 520nm when it should be 400nm. The velocity of this star is ______km/s
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18d

Is there any dynamical reason for the winter solstice to happen close to the perihelion?
When the winter solstice arrives, the angular momentum of the Earth, its orbital angular momentum and its radius vector with the orbital focus in the Sun are in the same plane. This happens quite... more
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18d

In what ways can a lunar eclipse occur?
In what ways can a lunar eclipse occur?Also, on what percentage of the Earth are they usually viewable? I am aware that there are multiple configurations that constitute a lunar eclipse (umbral,... more
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18d

Do tides occur on planets like Neptune, having water?
I mean, we experience tides here on earth because of combined effect of gravitational field of moon and sun. So I thought that tides could also occur on other planets. Let us consider Neptune where... more
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1cfabc5f 69a7 40d1 8b92 f53ee1546328

18d

How is distance measured to far away stars and galaxies?
What I need is an accurate description of the methods used to determine the distance to Andromeda. The Parallax method is for nearby objects as I presume. The red shift method applies, but how do... more
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19d

How did pre-Copernican astronomers accurately predict planetary position?
Copernican elements (circular orbital elements) are not very accurate. But Copernicus simplified our understanding a great deal by placing the Sun at the center of the system. Im astonished by the... more
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20d

What size aperature would I need to find and see the supernova in M51?
On June 2, 2011, a new supernova was identified by an amateur French astronomer in M51.What size telescope aperture would one need to have any chance of seeing this? Given the right sized scope,... more
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21d

How can the date of lunar eclipses be calculated by hand?
How can the date of lunar eclipses be calculated? Especially without the aid of a computer.
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21d

Solar system, visible stars and deep sky objects?
Since I've seen that galaxies are often called "deep sky objects", as opposed to individual stars, does this mean that all visible stars in the night sky actually only belong to The Milky Way... more
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23d

View of the Sun from Voyager 1?
Today Voyager 1 is approximately 122 AU distance from the Sun. What does the sun look like from this distance? How much brighter does the sun appear to the naked eye compared to other stars in... more
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23d

How big of a telescope to view Gliese 581g in great detail?
I've always been interested in mega sized telescopes and how big they would have to be to see exoplanets in great detail. So, Gliese 581g is 22 light years away. Could we build a telescope in space... more
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24d

Lunar twilight and sixth magnitude stars?
Summary: when the Moon is x degrees below the horizon, it interferes with stargazing the same as astronomical twilight would. What is x (as a function of the Moon's phase)? We define civil,... more
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24d

Is a total solar eclipse a common phenomenon?
Is our moon "special" for creating a total solar eclipse? Is it common or rather rare for a moon to create a total solar eclipse the way our moon does, with corona and such?
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24d

How does the view of night sky change as the Sun orbits around the Milky Way?
I know that the Sun and hence the Solar System orbits around the galactic center of the Milky Way. Does this rotation cause any visible change in the night sky?I know that human life span is... more
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469537fd 1207 474d b1fd f16863a5f8a8

26d

Does a celestial system exhibit a collective magnetic field?
Sol exhibits a magnetic field, most of the planets in orbit around Sol exhibit a magnetic field - strong and weak both. Does the solar system as a whole exhibit a magnetic field? Does the paradigm... more
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26d

Could we detect a nuclear explosion near Proxima Centauri?
How big would a nuclear explosion in open space around 1 AU from Proxima Centauri have to be for it to be detectable with current technology? Assume best-case scenarios, such as we're specifically... more
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26d

Can gamma rays be used to investigate heavenly bodies?
This is a very layman level question. I watch a lot of documentaries, that's my only qualification. I have seen in documentaries that gamma rays have an extraordinary penetrating power. So if we... more
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26d

What are the demographics of stars visible to the naked eye?
Of the stars that can be seen with the naked eye, what are the distributions of each type? For example, how many are main sequence? how many are Super Red giants/white dwarfs/neutron... more
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26d

From how far does visible light reach the Earth to be observable by a telescope that operates in this spectrum?
Gas clouds for instance absorb light. A star behind such a cloud would be not observable, because its visible light does not reach us.
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26d

How is celestial navigation done on a low-level?
When we send a probe off to Jupiter or Saturn, or even Earth orbit, how are the rocket firings timed and coordinated?For instance, when I want to drive to another city I pull onto the highway and... more
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28d

If the moon was purple what colour would the sun be?
Think if instead of white the moon would be purple!Based if this considering the sun gives the moon its light and the moon sometimes appears orange like the sun in turn what colour would the sun... more
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28d

The most likely method of communication with extra-terrestrial life-forms is probably through...
A. Interstellar space travel (spacecraft).B.  Radio C. Smoke Signals.
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